Blockchain And Crypto x402 offerings

Scale ether amounts into wei integer strings for transfers and tx value. Call when preparing value fields, allowances, or transfers denominated in ETH. Returns wei integer string and eth input as deterministic JSON for $0.001 USDC via x402 on Base. First-party local math only—no RPC, live market feed, API keys, storage, or mediagen. Advisory only; the caller owns capital, risk, and production controls.

Ethereum (ETH) price in USD now, with 24h and 7d change — Genesis402 / UnyKorn Operator Network

Inspect any Ethereum address: EOA vs contract vs EIP-7702 delegated, ETH balance, nonce, proxy implementation (EIP-1967/1167/zos), and ERC-20 name/symbol/decimals/supply.

Heuristic risk flags for a Ethereum contract from free public data: Sourcify verification, upgradeable proxy + admin, owner type, mint/pause/blacklist/fee selectors, bytecode size. Not an audit or financial advice.

Ethereum gas price oracle. Returns the current Ethereum gas price as an EIP-1559 base fee plus priority-fee estimates across five confidence tiers, all in gwei, so an agent can price a transaction before it signs one. Ethereum mainnet only. Keyless, via Blocknative.

Check a Ethereum wallet's ERC-20 approvals: allowances for 8 major tokens (USDC, USDT, WETH, DAI...) to common spenders (Permit2, Uniswap Universal Router v4, Uniswap Universal Router, Uniswap SwapRouter02...); flags unlimited approvals.

Use when: what did this Ethereum transaction do? Explain a Ethereum transaction: status, fee, decoded method + args (openchain signature DB), and ERC-20 transfers with symbols and human amounts.

Compact Base wallet snapshot with native ETH, ERC-20 balances, USDC balance and address metadata.

Normalized crypto perpetuals snapshot across Binance, Bybit and Hyperliquid in one call: current funding rate, funding interval, annualized funding (APR %), mark price, index price, premium/basis %, open interest (base units and USD). Query: ?symbols=BTC,ETH,SOL (max 10). JSON only, ~20s cache, partial results if a venue is down.

Circulating supply per stablecoin from DeFiLlama with computed net flows (delta_24h/delta_7d/delta_30d = net mint minus burn), peg type, peg mechanism and current price. Query: ?symbol=USDT for one asset, or ?top=10 (1-50, default 10) for the largest by supply. Served with a 30min cache.

Query raw event logs by contract address and/or indexed topics over a block range via eth_getLogs — the indexing primitive, across Base, Ethereum, Optimism, Arbitrum, Polygon, Gnosis. Filter by address, topic0 (the event signature) and topic1-3, get back address, topics, data, block number, transaction hash and log index. Ranges are capped at 500 blocks and 200 logs so the call always answers instead of being rejected by a public node, and BOTH caps are reported explicitly in the response (trun

Solidity ABI calldata encoder — encode canonical typed values for an EVM smart-contract function call, with an optional selector and exact 256-bit integers.

EVM address checksum and validation tool — normalize one Ethereum-compatible address and validate mixed-case EIP-55 input offline.

Strict Solidity ABI calldata decoder — decode canonical EVM smart-contract function calls or typed values, verify selectors, and reject ambiguous offsets or padding.

CREATE2 deterministic contract address calculator — derive the EIP-1014 EVM deployment address, preimage, hashes, and EIP-55 checksum offline without RPC.

Solana Program Derived Address (PDA) calculator — derive the canonical off-curve address and bump from bounded public seeds offline, without RPC or key handling.

EVM address checksum and validation — check an Ethereum/Base address format before sending funds.

EVM address format, lowercase form and EIP-55 checksum in checksum mode — check an Ethereum/Base address before sending funds.

Use when an agent signs transactions one after another and must not collide with one already in flight: the confirmed nonce, the pending nonce (the one to use while an earlier transaction is still unmined) and whether the address is a contract. Do not use to check the transaction is affordable (/v1/evm/balance for the funds, /v1/evm/estimate-gas for the cost). No API key, no account.

EVM Amount Min Check: checks an actual raw amount against a minimum raw amount using only bounded caller-supplied values. Call when you need a bounded evm amount min check result before signing, submitting, replacing, or accepting an EVM/Base transaction assembled from caller-owned data. Returns normalized transaction evidence, calculated budget or shape findings, and a fail-closed preflight status for EVM Amount Min Check as versioned deterministic JSON. Price: $0.001 USDC via x402 on Base or…

Fetch a block header by number, hash, or "latest" on Ethereum, Base, Arbitrum, Optimism, Polygon, or BNB Chain: timestamp, miner, gas used/limit, base fee, transaction count, size. Public JSON-RPC, no API keys. POST a JSON body like: {"chain":"base","block":"latest"}

Retrieve a live EVM block header and a bounded list of real transaction hashes by height, tag, or block hash.

Use when an agent has to decide whether what it just read on-chain is fresh, or whether a node is behind: the latest block height, its timestamp and how many seconds old the chain head is. Do not use for one transaction's outcome (/v1/evm/tx) or to compare several chains at once (/v1/evm/chains does all of them in one call). Flat price, no rate limits, no API key, no account.

Run a low-cost wallet balance lookup for native ETH and official USDC on Base, Ethereum, or Arbitrum, with an estimated ETH USD value. This is not a complete token or NFT portfolio.